On 25/09/2017 14:20, Albert-Jan Roskam wrote:
Hi,
With Python 3.5 under Windows I am using the logging module to log messages to
stdout (and to a file), but this occasionally causes logging errors because
some characters cannot be represented in the codepage used by cmd.exe (cp850,
aka OEM codepage, I think). What is the best way to prevent this from
happening? The program runs fine, but the error is distracting. I know I can
use s.encode(sys.stdout.encoding, 'replace') and log that, but this is ugly and
tedious to do when there are many log messages. I also don't understand why %r
(instead of %s) still causes an error. I thought that the character
representation uses only ascii characters?!
import logging
import sys
assert sys.version_info.major > 2
logging.basicConfig(filename="d:/log.txt",
level=logging.DEBUG,format='%(asctime)s %(message)s')
handler = logging.StreamHandler(stream=sys.stdout)
logger = logging.getLogger(__name__)
logger.addHandler(handler)
s = '\u20ac'
logger.info("euro sign: %r", s)
--- Logging error ---
Traceback (most recent call last):
File "c:\python3.5\lib\logging\__init__.py", line 982, in emit
stream.write(msg)
File "c:\python3.5\lib\encodings\cp850.py", line 19, in encode
return codecs.charmap_encode(input,self.errors,encoding_map)[0]
UnicodeEncodeError: 'charmap' codec can't encode character '\u20ac' in position 12:
character maps to <undefined>
Call stack:
File "q:\temp\logcheck.py", line 10, in <module>
logger.info("euro sign: %r", s)
Message: 'euro sign: %r'
Arguments: ('\u20ac',)
Thanks in advance for your replies!
Albert-Jan
Rather than change your code can you change the codepage with the chcp
command?
C:\Users\Mark\Documents\MyPython>chcp
Active code page: 65001
C:\Users\Mark\Documents\MyPython>type mytest.py
import logging
import sys
assert sys.version_info.major > 2
logging.basicConfig(filename="d:/log.txt",
level=logging.DEBUG,format='%(asctime)s %(message)s')
handler = logging.StreamHandler(stream=sys.stdout)
logger = logging.getLogger(__name__)
logger.addHandler(handler)
s = '\u20ac'
logger.info("euro sign: %r", s)
C:\Users\Mark\Documents\MyPython>mytest.py
euro sign: '€'
--
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.
Mark Lawrence
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